Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/CodeDomExtensionMethods.cs

@@ -0,0 +1,45 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.CodeDom;
+
+    static class CodeDomExtensionMethods
+    {
+        internal static CodeVariableReferenceExpression DeclareVar(this CodeStatementCollection block, Type type,
+            string name, CodeExpression initExpression)
+        {
+            block.Add(new CodeVariableDeclarationStatement()
+                {
+                    Name = name,
+                    Type = new CodeTypeReference(type),
+                    InitExpression = initExpression
+                });
+            return new CodeVariableReferenceExpression(name);
+        }
+
+        internal static CodeFieldReferenceExpression Field(this CodeExpression targetObject, string fieldName)
+        {
+            return new CodeFieldReferenceExpression(targetObject, fieldName);
+        }
+
+        internal static CodeMethodInvokeExpression Invoke(this CodeExpression targetObject, string methodName,
+            params CodeExpression[] parameters)
+        {
+            return new CodeMethodInvokeExpression(targetObject, methodName, parameters);
+        }
+
+        internal static CodeObjectCreateExpression New(this Type type, params CodeExpression[] parameters)
+        {
+            return new CodeObjectCreateExpression(type, parameters);
+        }
+
+        internal static CodePropertyReferenceExpression Property(this CodeExpression targetObject, string propertyName)
+        {
+            return new CodePropertyReferenceExpression(targetObject, propertyName);
+        }
+    }
+}